Artificial wetland with combined fillers and treating process thereof

Abstract

The invention provides an artificial wetland with combined fillers for the advanced treatment of the effluent coking wastewater of iron and steel enterprises, which sequentially comprises a water inlet area, a wetland processing unit area and a water outlet area, wherein the wetland processing unit area sequentially comprises a gravel filler section, an iron carbon filler section and a manganese sand filler section; and a soil covering layer and wetland plants are arranged on the surface of the wetland. By using iron carbon, manganese sand and gravels as combined fillers and using emerging plants (such as cattail, Scirpus tabernaemontani, Thalia dealbata, reed and the like) having large biomass, salinization resistance and high metal and organic substance adsorptive power as a composite plant bed, the invention forms a horizontal subsurface flow artificial wetland. Thus, when industrial waste water moves into the artificial wetland, pollutants can be removed on the basis of a series of physical, chemical and biological interaction among the fillers, plants and microorganisms. The process provided by the invention has high pollutant shock load resistance and good treatment effect. Besides, the outlet water is stable, and main indexes of the outlet water can meet the Reuse of Urban Recycling Water-Water Quality Standard for Industrial Uses (GB / T 19923-2005). Thus, the outlet water can be recycled as circulating cooling water for steel enterprises.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a process for advanced treatment of coking waste water discharged from iron and steel enterprises by using iron carbon, gravel and manganese sand as combined fillers in artificial wetlands. Background technique [0002] Coking wastewater has a huge amount of water resources and complex water quality components. In addition to containing a large amount of organic matter such as phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds, it also contains toxic and harmful pollutants such as cyanide, inorganic fluoride ions, and ammonia nitrogen. Coking wastewater will pose serious harm to the environment and human health. At present, the research on advanced treatment technology for coking wastewater reuse is relatively hot at home and abroad, but most of them focus on the use of some physical and chemical treatment technologies, inclu...

AI Technical Summary

Problems solved by technology

Although constructed wetland technology has begun to be applied to the treatment of industrial wastewater, there are few reports on its application in the reuse treatment of effluent coking wastewater

Images